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H. & W. E. BLEEGKER & S. D. VOSE.

MOLD FOR CASTING.

PATENTED DEC. 25, 1849.

ilnrrnn diaries PATE T @rrrca IinNnY BLEEOKER, w. n BL ncxnn, AND SAML.n. VOSE, or ALBANY,

- NEW YORK.

IMPROVED PROCESS OF MAKING THIN lRON GASTlNGS.

Specification forming part of Let ers Patent No. 6,969. dated December25, i 10.

- making part of this specification.

Figure 1 is a perspective view of the open mold standing on its edge,showing the surfaces between which the melted ironis poured,

with the boxes or knapsacks of non-conducting substance attached. Fig. 2is a vertical section of the complete mold closed through the line at m,Fig. 1. I

Similar letters in both figures refer to corresponding parts.

The nature of our invention consists in the manner of using a combinedmold in repetition for the purpose of casting light cast iron plates.

The following is a description of the invention or improvement: Twoblocks of iron or metal, A and B, fitted closely and faced, arehinged-or connected together on their edges in the manner shown in thedrawings, Fig. l, the process of opening or closing being performed likethe opening and shutting of a book or the raising or depressing of alid. A hollow space, H, is then formed in or between these two blocks,which, when they are closed together, correspond in size and shape tothe pattern or casting wanted. In casting straight or uneven andconfigurated plates the mold is made to inclose a space that exactlycorresponds with that which would exist in an ordinary mold of sandafter any given pattern had been molded and withdrawn and the sand moldclosed together. The surfaces of the mold may be cut or engraved fromany given measure or model, but for configurated plates can be formedmore readily and cheaply by taking false casts from a pattern inplaster, and then casting these false casts in metal and fitting andconnecting them together. When the mold is thus formed, a channel orsprue is cut leading from the cavity to some point at the outer edge ofthe mold, as exhibited in Fig. 1, letter D, to admit the iron whenpoured is laid on by smoking the surfaces of oil; but when the moldbecomes heated to into the mold. Before using the mold thecavity andsprue are coated on both sides with smoke. In order to obtain plates ofa desirable softness, we heat the mold to a given temperature beforeusing it, which is kept up by the process of repeated castings. Toequalize the high temperature of the mold and to assist in maintaining ahigh and uniform heat, we apply a knapsack or covering to the outsidesof the mold, which consists of a stratum of non-conducting substance (ofground pumice-stone or earth) incloscd in abox or frame, 0 c andfastened to the metal blocks. The mold is then clamped together by hooksE, or by any other convenient method, and is then ready for use. Asingle mold thus prepared answers for an indefinite number of plates,

The sur and is permanent in its character. faces of the castings arebright and smooth and require no cleaning or scra nng. The mold beingproperly fastened together, it has sufficient strength to resist thepressure or unequal straining of the metal i n its liquid state, andtherefore prevents inequality ofthiekness, which renders castings liableto crack. mold being smooth and solid, no loose particles can minglewith the poured metal to render it unsound, and there can exist no decomposition of water or gases. When the mold is in operation, the castinare thrown out hot as fast as the iron assumes a solid form. In

the first few operations of the mold the coating with a torch an intenseredness, liquid oil is thrown on, which immediately ignites and burnsoff, leaving a residuum of smoke or carbon on the sun face. This coatingresists the action of the iron and prevents adhesion between the moldand the casting. The design of the knapsack is to retard the naturalconducting-power of the metal part of the mold. The non conductingstratum confines the heat withwhich the mold becomes surcharged,checking the toe sudden crystallization of the fused metahandpreventingthe chilling or hardening of the casing. Besides assisting toproduce soft castings, this knapsack maintains an equality of heatbetween the inner and outer sides of the parts of the mold, and byequalizing the ex pansion and contrac- The V tion of the inner and outersides of the molcland provided with a case or knapsack which blocksprevents the mold itself from Warping contains anon-conducting material,the whole and cracking. process being conducted substantially in theWhat we claim as ouriuvention, and desire manner and for the purposesherein-set forth.

to secure by Letters Patent, is- I HENRY BLEEOKER. f

The process of making thin or light castings WILLIAM E. BLEEOKER. l

of iron by pouring the metal into a mold of SAML. D. VOSE.

iron that surrounds the article to be cast e11- I11 presence oftirely,withthe exception of the gates, said HENRY L. WILsON,

mold being previously smokecLon the inside, J Sussrous.

